Ultrasonic, Laser, Electricity, Advanced measurement using image processing, Diagnostic technology

  • High temporal resolution of the ultrasonic measurement
  • Air-coupled Ultrasound Testing
  • Phased array ultrasonic
  • High temperature measurement (1200 ℃)

High temporal resolution of the ultrasonic measurement

High temporal resolution of ultrasonic measurement refers to the precision of a measurement with respect to time. Often there is a tradeoff between temporal resolution of a measurement and its spatial resolution. In some contexts such as particle physics, this trade-off can be attributed to the finite speed of sound and the fact that it takes a certain period of time for carrying information to reach the observer. In this time, the system might have undergone changes itself. Thus, the longer pulse wave has to travel the lower is the temporal resolution. Ultrasonic measurement can be used in high temporal resolution measuring and also very precise measurement in piping system in the industrial and Nuclear power plant for instance in United states. (Updated 2012/09/16)

Air-coupled Ultrasound Testing

Airborne ultrasound is used throughout the world for condition monitoring, energy conservation and quality assurance programs. Airborne ultrasound technology provides solutions for locating a variety of potential problems in plants. The three main areas are leak detection, mechanical inspection/trending and electrical inspection.
Instruments based on airborne ultrasound sense high frequency sounds produced by leaks, electrical emissions and mechanical operations. They translate these sounds down into the audible range by an electronic process called heterodyning where they are heard through headphones and observed as intensity increments, typically decibels, on a display panel.
Since ultrasound is composed of high frequencies that are not heard by the human ear, the heterodyning process allows users of airborne ultrasound instruments to ‘hear’ an accurate translation of these sounds helping them identify subtle changes in operating equipment that might normally be overlooked, providing early warning capability.
Preventing the loss of air, nitrogen and other gas leaks is an important service Arc Flash Advisors provides to plants and other facilities. This service can potentially save your business significantly from energy losses.
Ultrasonic Testing is an important and valuable technique that Arc Flash Advisors uses to detect and prevent problems. We utilize Ultrasonic Testing on non-rotating assets such as steam lines, steam traps, vacuum chambers, valves, air lines, gas lines and pressure vessels.
Leak Detection is an important function for detecting and protecting problems in assets. Ultrasonic Testing is a very useful and our primary technique for leak detection. We often couple Ultrasonic Testing with IR (Infrared) Thermography to locate electrical leaks and faults.
(Updated 2012/09/16)

Phased array ultrasonic

Phased array ultrasonic (PA) is an advanced method of ultrasonic testing that has applications in medical imaging and industrial nondestructive testing. Common applications are to noninvasively examine the heart or to find flaws in manufactured materials such as welds. Single-element (non-phased array) probes, known technically as monolithic probes, emit a beam in a fixed direction. To test or interrogate a large volume of material, a conventional probe must be physically scanned (moved or turned) to sweep the beam through the area of interest. In contrast, the beam from a phased array probe can be moved electronically, without moving the probe, and can be swept through a wide volume of material at high speed. The beam is controllable because a phased array probe is made up of multiple small elements, each of which can be pulsed individually at a computer-calculated timing. The term phased refers to the timing, and the term array refers to the multiple elements. Phased array ultrasonic testing is based on principles of wave physics, which also have applications in fields such as optics and electromagnetic antennae. The PA probe consists of many small ultrasonic transducers, each of which can be pulsed independently. By varying the timing, for instance by pulsing the elements one by one in sequence along a row, a pattern of constructive interference is set up that results in a beam at a set angle. In other words, the beam can be steered electronically. The beam is swept like a search-light through the tissue or object being examined, and the data from multiple beams are put together to make a visual image showing a slice through the object. (Updated 2012/09/16)

High temperature measurement (1200 ℃)

It’s extremely difficult to measure high-temperature flow, which appears in nuclear field, e.g. water and boiling water flow in primary and secondary circuits of nuclear power plants; liquid metal flow in fast reactor systems; molten salt flow etc. In this laboratory, high-temperature liquid flow measurement is developed with Ultrasonic Velocity Profiler (UVP), non-contact measurement using ultrasonic pulse to measure flow velocity distribution. Also, molten glass ultrasonic transmitter, which would be able to withstand 1200°C, and waveguide rod system are developed.(Updated 2012/09/16)

  • Void fraction measurement (WMS)
  • Dark-field micro- and nano-PIV
  • Wall detection UVP

Void fraction measurement (WMS)

The development of reliable hydrodynamic models for two-phase flows depends on the availability of accurate data for the phase distribution throughout the cross-section of ducts. In gas?liquid systems, the distribution of the volumetric gas fraction has to be measured. From the point of view of modern CFD code development, it is more and more desirable to get instantaneous phase distributions with a high resolution in space and time. A wire-mesh sensor, which is based on local conductivity measurement between gas and liquid phases, allowed the measurement of the local instantaneous true gas velocity besides the measurement under of the local instantaneous void fraction in pipe or rectangular channel. A wire-mesh sensor in Taylor-Couette flow has been developed in this laboratory. This measurement technique allows to measure bubble characteristics such as bubble volume, diameter, and velocity. This measurement technique can also visualize bubble behavior with high space and time resolution. (Updated 2012/09/16)

Dark-field micro- and nano-PIV

Micro (or nano) PIV is used to measure the flow field in a small region. When observing small regions, the reflected light intensity is small. Therefore, for example some fluorescent agent is usually included to increase the light intensity. This method’s optical system can be used to measure the motion of microorganisms and others without the use of fluorescent agents. (Updated 2012/09/16)

Wall detection UVP

Our self-developed UVP system can be extended to “Wall detection UVP” technique. This technique enables to detect the wall position and measure velocity profile, simultaniously. One of the possible applications is the pipeline maintenance.. Cleaning nozzles with water jet or drills are used for maintenance of long pipe. Long pipe has branches, and ultrasonic transducer can help to know the position of nozzle or drill by detecting partitioning walls and the branches. (Updated 2014/11/21)